platform/x86: intel-hid: use devm_input_allocate_device() for HID events input device

intel_hid_input_setup() is only called from the platform driver's .probe
callback.  Use the devm variant of input_allocate_device() for
allocating memory for the HID events input device in order to simplify
two error paths and get rid of intel_hid_input_destroy().

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-and-tested-by: Alex Hung <alex.hung@canonical.com>